Yeah, because they're already fighting that fight. In Levant. They just use proxies.
Competent military forces don't have the luxury of deciding what's hypothetical and what's not. The US had prepared plans for invading the UK right after WW2.(
https://en.wikipedia.org/wiki/War_Plan_Red)
They didn't speculate on if its likely or not, they just planned it and prepared for it. That's how it is, how it should be for us as well.
"Successful" wars rarely get to be equal affairs. American military enthusiasts often brag about how unfair they fight, bringing 100 million dollar jets to dogfights with MIG-21s and using multi-million dollar drones to kill carpet salesmen. Its part of their playbook to win.
Which is to defend the motherland against outside threats, right?